/// <summary>
/// Creates an instance of the options.
/// </summary>
public ExceptionMappingServicesOptions()
{
Schemes = new Dictionary <string, ExceptionMappingSchemeRegistration>(StringComparer.Ordinal);
// By default, unhandled exception is rethrown
_fallbackHandler = ctx =>
{
ctx.Result = ExceptionHandlingResult.Rethrow(ctx.Exception);
return(default);
public async Task <ExceptionHandlingResult> MapAsync(
Exception exception,
ExceptionMappingContext?context)
{
if (exception == null)
{
throw new ArgumentNullException(nameof(exception));
}
context ??= new ExceptionMappingContext();
try
{
foreach (var scheme in _schemeProvider.GetSchemes())
{
var handler = await _handlerProvider.GetHandlerAsync(scheme);
var result = await handler.HandleExceptionAsync(exception, context);
if (result.IsHandledSuccessfully)
{
return(result);
}
}
var fallbackContext = new ExceptionHandlingContext(exception, context);
await _options.FallbackExceptionHandler(fallbackContext);
return(fallbackContext.Result);
}
catch (Exception ex)
{
// An unhandled exception occurred while executing the handler
// This is not expected as handlers should be exception-free. When this happens, log the exception
// and re-throw the *original* exception
_logger.LogTrace(ex, "Unhandled exception occurred in handlers.");
}
return(ExceptionHandlingResult.Rethrow(exception));
}